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Spiny sowthistle
is a winter annual that is actually in the sunflower family and
not a true thistle. The leaves form basal and are deeply lobed.
They then alternate on stems. The upper leaves are less lobed but
have spiny edges. The stems are hollow and contain hair only the
lower portion. Both the leaves and stems contain a milky solution.
The stems only branch in the inflorescence. |
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Spiny sowthistle spreads by seed. It flowers from late spring through the summer, depending on the location. The flower is yellow, resembling a dandelion, but forms in a corymbiform cluster. The root of spiny sowthistle is a taproot. Spiny sowthistle is found throughout the United States. |
| Integrated Pest Management Control Recommendations: |
Cultural Practices:
Spiny sowthistle is found in waste areas and other open areas such as
roadsides and thin turf. It can be controlled by mowing which prevents
the stem and flowers from forming and eliminates seed formation. The plant
can also be cut out.
Herbicide
Use:
Make your postemergent herbicide application when spiny sowthistle is
young and actively growing. For best results, treat prior to bolting.
University Links | Gordon's Recommendations | Germination Dates
